KR100985360B1 - AN APPARATUS FOR PREVENTING LINE DEFECTS FROM FORMING ON THE SURFACES OF SILICON STEEL ON MgO COATING - Google Patents

Abstract

The present invention provides an ultrasonic vibration to the surface of the steel sheet coated with magnesium oxide to make uniform vibration in the steel sheet, thereby preventing MgO of the electrical steel sheet improved to prevent the occurrence of streak coating and uncoated portions of magnesium oxide on the surface of the steel sheet. The present invention relates to a stripe preventing device during coating.

The present invention includes a plurality of ultrasonic generators for applying ultrasonic waves to the upper and lower sides of the steel sheet at the rear of the coating roll, and includes an ultrasonic signal generator for providing a signal to the ultrasonic generator to impart vibration to the steel sheet. The present invention provides an anti-striping device for MgO coating of an electrical steel sheet, which is configured to remove air bubbles and remove streaks due to the groove groove shape of the coating roll.

According to the present invention, it is possible to remove the air bubbles formed on the surface of the electrical steel sheet by removing the air bubbles formed on the surface of the steel sheet by automatically applying ultrasonic vibration to the surface of the steel plate coated with magnesium oxide, without manual operation by the operator, The improved effect is obtained by smoothing the stripe shape of the magnesium oxide formed by the grooves of the coating roll to obtain a plating layer having a uniform thickness.

Coating Roll, Ultrasonic Generator, Ultrasonic Vibration, MgO Coating, Stripe Prevention Device

Description

Anti-stripe device for MgO coating of electrical steel sheet {AN APPARATUS FOR PREVENTING LINE DEFECTS FROM FORMING ON THE SURFACES OF SILICON STEEL ON MgO COATING}

1 is an overall configuration diagram showing a magnesium oxide solution coating equipment according to the prior art;

2 is a side view showing a magnesium oxide solution coating apparatus according to the prior art;

3 is a partial cutaway perspective view showing a magnesium oxide solution coating apparatus according to the prior art;

Figure 4 a), b), c) is a cross-sectional view showing in detail the coating layer by the magnesium oxide solution coating equipment according to the prior art;

5 is an external perspective view showing an anti-stripe device when MgO coating of an electrical steel sheet according to the present invention;

Figure 6 is an overall configuration diagram showing the anti-stripes when MgO coating of the electrical steel sheet according to the present invention;

7 is an operation explanatory diagram showing an operating state of the anti-striping device when MgO coating of the electrical steel sheet according to the present invention;

Figure 8 a), b), c) is a cross-sectional view showing in detail the state in which the coating layer of the magnesium oxide solution coating equipment is stably formed by the anti-stripe device during MgO coating of the electrical steel sheet according to the present invention.                 

       <Description of the symbols for the main parts of the drawings>

1 .... Stripe prevention device in MgO coating of electrical steel sheet

10a, 10b ... ultrasonic generator 12a, 12b .... loudspeaker

14a, 14b ... Ultrasonic Transducer 16 ....

20 .... Signal Generator 25a, 25b .... Bubble Detector

50 .... Balance 52 ... Rail

55 .... Frame 57 .... Driving wheel

59 .... Travel motor 62 .... Screw shaft

65 .... forward / reverse motor 67a .... right hand thread

67b ... left hand thread 69a, 69b ... lifting block

72a, 72b, 72c, 72d .... limit switch

74 ... Touch rod 78a, 78b ... Guide turning

80a, 80b ... vertical pillar 82a, 82b ... inner groove

100 .... Electrical steel sheet manufacturing equipment 110a, 110b ... Upper and lower rolls

112 .... Groove Home 130 .... Air Bubbles

C ... coating layer L ... magnesium oxide solution

P .... Striped S .... Electrical Steel Sheet

The present invention relates to a device for preventing the formation of streaks on the surface of the steel sheet caused by the groove phenomenon of the roll when coating magnesium oxide (MgO) on the surface of the electrical steel sheet in the electrical steel sheet manufacturing equipment, in more detail MgO is applied to MgO coating of the improved electrical steel sheet to provide the ultrasonic vibration to the surface of the steel plate coated with magnesium oxide to make uniform vibration in the steel plate, thereby preventing the occurrence of streak coating and uncoated portions of magnesium oxide on the surface of the steel sheet. It relates to a stripe prevention device.

In general, the electrical steel sheet manufacturing equipment 100, as shown in Figure 1, when coating the magnesium oxide (MgO) on the electrical steel sheet (S), between the upper and lower rolls (110a, 110b) electrical steel sheet (S) is passed through, and the magnesium oxide solution (L) is supplied through the magnesium oxide supply pipe 120 to the upper portion of the electrical steel sheet (S) to proceed, this magnesium oxide solution (L) is the upper roll (110a) It exists between the steel plate S and the upper surface of the steel plate S.

In addition, the lower roll 110b is rotated while being partially locked in the solution reservoir 132 containing the magnesium oxide solution L therein, while supporting the lower surface of the steel sheet S by contacting and supporting the lower surface of the steel sheet S. It is to coat the magnesium oxide solution (L) on.

As described above, the upper and lower rolls 110a and 110b act as a plurality of coating rolls and oxidize the surface of the electrical steel sheet S in such a manner that an appropriate amount of magnesium oxide solution L is applied to the upper and lower surfaces of the electrical steel sheet S. The magnesium coating layer (C) is to be made.

Then, the electrical steel sheet (S) is coated in this way is transferred to the drying furnace 150 in the subsequent process has a structure in which the coating layer (C) is dried. However, the conventional magnesium oxide coating equipment 100, as shown in Figures 2 and 3, the upper and lower coating rolls (110a, 110b) are each a plurality of groove grooves 112 in the rotation direction thereof. ) To form. Such groove grooves 112 are intended to provide good coating performance by increasing the contact surface area with the electrical steel sheet (S), but due to such groove grooves 112, the acid in the groove grooves 112 and The difference in contact strength with the steel sheet (S) occurs between the valleys to form a stripe (P) on the surface of the steel sheet (S).

That is, the magnesium oxide solution L applied to the surface of the steel sheet S in the shape of the groove grooves 112 of the coating rolls 110a and 110b is caused by gravity from the shape of the groove grooves 112. Although it is intended to be coated in a form without streaks P while being horizontal, the shape of the groove groove 112 is maintained by the viscosity of the magnesium oxide solution L to form streaks P, and the electrical steel sheet S Will not form a coating layer (C) of a uniform thickness on the surface of.

In addition, the conventional installation 100 has a problem of forming and continuing air bubbles 130 at the starting point where the coating rolls 110a and 110b and the steel sheet S start to contact each other. That is, the electrical steel sheet (S) advances between the upper and lower coating rolls (110a, 110b), the magnesium oxide solution (A) to the contact point of the electrical steel sheet (S) and the upper and lower coating rolls (110a, 110b) that proceed in this way When the L) is supplied, the air bubbles 130 are mixed and thus the air bubbles 130 formed at the contact points of the coating rolls 110a and 110b and the steel sheet S are not easily removed. And continuously remain in the forming region, preventing the magnesium oxide from being coated on the surface of the steel sheet S in this portion.

Accordingly, in the electrical steel sheet S, an uncoated region is generated in the air bubble 130 region, and as shown in FIG. 4, the uncoated region C ′ of magnesium oxide is formed.

This uncoated form of magnesium oxide is as shown in FIG. That is, the action force that resists the magnesium oxide solution (L) is generated in the portion where the air bubbles 130 are formed, and thus the magnesium oxide solution (L) is not applied to the electrical steel sheet (S), so that the worker is conventionally made of the electrical steel sheet ( The side edge of S) is hit by using a separate jig (not shown) so that the air bubbles 130 formed between the rolls are destroyed due to the vibration generated during the hit, or pushed out of the solution L to be removed. In this case, the stripe pattern P generated by the groove groove 112 is removed.

Therefore, the conventional method of removing the air bubbles 130 and preventing the formation of streaks (P) is that the worker should always wait in close proximity to the production line, the work is cumbersome, there is always the risk of safety accidents, There was a problem that the work load is reduced due to the large workload.

The present invention is to solve the conventional problems as described above, the purpose is to remove the air bubbles formed on the surface of the electrical steel sheet by automatically applying vibration to the surface of the steel plate coated with magnesium oxide, not by the manual operation of the operator To remove the uncoated areas, remove streaks by the grooves of the grooves, to ensure safe work, and at the same time to improve the productivity and quality of the steel sheet, the improved streaks in MgO coating In providing a prevention device.

In order to achieve the above object, the present invention, in the case of coating magnesium oxide (MgO) on the surface of the electrical steel sheet in the electrical steel sheet manufacturing equipment, in the apparatus for preventing the coating layer defects on the surface of the steel sheet, at the rear of the coating roll It includes a plurality of ultrasonic generators for applying ultrasonic waves to the upper and lower sides of the steel sheet, including the ultrasonic signal generator for providing a signal to the ultrasonic generator to remove vibrations by ultrasonic vibration by applying vibration to the steel sheet, By providing a stripe preventing device in MgO coating of electrical steel sheet configured to remove stripes due to the groove groove shape of the coating roll.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

Striping prevention device (1) when MgO coating of the electrical steel sheet according to the present invention, when the coating of magnesium oxide (MgO) on the surface of the electrical steel sheet (S) in the electrical steel sheet manufacturing equipment, the coating roll (110a) (110b) By applying ultrasonic waves to the upper and lower sides of the steel sheet (S) from the rear to give a vibration to remove the air bubbles 130 and stripes (P) by the ultrasonic vibration.

The present invention has a plurality of ultrasonic generators 10a and 10b disposed above and below the steel sheet S at the rear side of the coating rolls 110a and 110b. The ultrasonic wave generators 10a and 10b respectively include a plurality of expansion plates 12a and 12b extending in the longitudinal direction of the steel sheet S at upper and lower portions of the steel sheet S, and the expansion plates 12a and 12b. And a signal generator 20 having ultrasonic transducers 14a and 14b respectively mounted to the fields, and providing ultrasonic signals using the electrical conductors 16 to the ultrasonic transducers 14a and 14b.

The signal generator 20 converts an alternating current of 60 Hz of 120 V into electrical energy of 20 KHz of about 1,000 V, which is converted into mechanical vibration by the ultrasonic transducers 14a and 14b. In addition, the square plate-shaped hexagonal plates 12a and 12b to which such mechanical vibrations are transmitted are capable of converting and amplifying such mechanical vibrations into a frequency of 20 KHz.

In addition, the present invention includes bubble detectors 25a and 25b for operating the ultrasonic wave generators 10a and 10b according to a preset operation method in the ultrasonic signal generator 20. The bubble detectors 25a and 25b are made of a photo sensor, and when the bubbles are formed by observing a contact point between the coating rolls 110a and 110b and the electrical steel sheet S, an electrical signal is generated. By providing the signal generator 20 to the signal generator 20, the ultrasonic generators 10a and 10b are operated in a preset operation mode.

For example, when the upper ultrasonic generator 10a is operated and stopped for one second, the lower ultrasonic generator 10b is stopped during the operation of the upper ultrasonic generator 10a, and the upper ultrasonic generator 10a is stopped. Is stopped, the lower side ultrasonic generator 10b is stopped for 1 second, and when the lower side ultrasonic generator 10b is stopped, the upper side ultrasonic generator 10a is operated again for 1 second and then alternately operates in a manner of stopping. The stop is repeated one after another.

Through this operation, the upper and lower ultrasonic generators 10a and 10b are prevented from being operated simultaneously, thereby preventing resonance, and accordingly, the electrical steel sheet S is sequentially repeated about 10 seconds. To give vibration.                     

Meanwhile, in the above, the signal generator 20 operates in a predetermined operation mode to alternately operate the ultrasonic generators 10a and 10b disposed above and below the steel sheet S. However, the present invention is different from the ultrasonic detector (not shown). And the like) are disposed on the side of the ultrasonic generators 10a and 10b to detect the ultrasonic waves generated from the ultrasonic generators 10a and 10b, and feed them back to the signal generator 20 for the ultrasonic generator 10a. Can be used to alternately drive 10b. That is, when the ultrasonic detector close to the upper ultrasonic generator 10a does not detect the ultrasonic wave, the upper ultrasonic generator 10a does not operate, and thus the signal generator 20 drives the lower ultrasonic generator 10b. By vibrating and stopping the ultrasonic waves for about one second from the bottom of the steel sheet (S) to the top.

In addition, when the ultrasonic detector (not shown) adjacent to the lower ultrasonic generator 10b does not detect the ultrasonic wave, the lower ultrasonic generator 10b does not operate, and thus the signal generator 20 may use the upper ultrasonic generator ( Driving 10a) vibrates and stops the ultrasonic waves for approximately one second from the top to the bottom of the steel sheet (S). By repeating such an operation, the signal generator 20 may operate in a preset operation mode by alternating the upper and lower ultrasonic generators 10a and 10b.

In addition, the present invention includes a trolley 50 for moving the ultrasonic wave generators 10a and 10b and the ultrasonic signal generators 20 up and down the electrical steel sheet S and maintaining them at an appropriate height. As shown in FIG. 5, the frame 55 is movable on the rail 52 formed in the width direction of the steel plate S, and a plurality of traveling wheels 57 are mounted on the lower end of the frame 55. Then, the vehicle is moved forward and backward by the traveling motor 59.

In addition, the frame 55 is mounted so that the screw shafts 62 are rotatable in the vertical direction, and the forward and reverse rotation motor 65 is connected to the upper end of the screw shaft 62, and the screw shaft ( 62, right-handed threaded parts 67a and left-handed threaded parts 67b are formed above and below, respectively. In addition, a plurality of lifting blocks 69a and 69b are screwed into the right screw portion 67a and the left screw portion 67b, respectively, and expansion plates 12a and 12b are respectively attached to the lifting block 69a and 69b. ) Are connected to each other.

In addition, a plurality of limit switches 72a, 72b, 72c, 72d are disposed at one side of the frame 55 at a predetermined height, and the limit switches 72a, 72b, 72c, 72d are provided. Touch rods 74 for transmitting an electrical signal in contact with the () are provided in the plurality of lifting blocks (69a, 69b), respectively.

In addition, the elevating blocks 69a and 69b are inner grooves 82a and 82b of the vertical pillars 80a and 80b that guide guides 78a and 78b protrude from both sides thereof to form the frame 55. And the sliding blocks 69a and 69b are slidably fitted along the right and left screw portions 67a and the left screw portions 67b of the screw shaft 62 by the operation of the forward and reverse rotation motor 65. It is guided up and down vertically up and down, and is operated simultaneously to move closer or farther from each other.

Accordingly, the ultrasonic wave generators 10a and 10b connected to the lifting blocks 69a and 69b may also be operated simultaneously so as to move closer to or away from each other with respect to the steel sheet S.                     

When the MgO coating of the electrical steel sheet of the present invention configured as described above to prevent the streaks (1) to give the ultrasonic vibration to the electrical steel sheet (S) to remove the air bubbles 130 and stripes (P), the balance ( The traveling motor 59 of the 50 operates to move the trolley 50 on the rail 52, and the amplification plates 12a and 12b of the upper and lower ultrasonic generators 10a and 10b are formed on the steel plate S. The upper and lower parts are arranged in the width direction thereof.

In this case, the loudspeaker plates 12a and 12b of the ultrasonic wave generators 10a and 10b are determined in advance so that the distance between the ultrasonic plates 10a and 10b is equal to each other. When S) is positioned, the forward and reverse rotation motors 65 are operated to narrow the lifting blocks 69a and 69b, and are disposed to be close to the upper and lower surfaces of the steel plate S. In this case, the plurality of limit switches 72a, 72b, 72c and 72d provided on the frame 55 of the trolley 50 and the touch rods 74 interact with each other to extend the loudspeaker plate 12a and 12b. ) Are to be maintained at a predetermined interval with respect to the upper and lower surfaces of the steel sheet (S).

As described above, in the state in which the ultrasonic generators 10a and 10b are disposed above and below the steel sheet S, the present invention, as shown in FIGS. 6 and 7, the electrical steel sheet S, the upper and lower coating rolls 110a. Pass through the (110b), and supplies a magnesium oxide solution (L) to the upper portion of the electrical steel sheet (S) to proceed through the magnesium oxide supply pipe 120, the upper and lower rolls are a plurality of coating roll (110a) It acts as 110b to bury an appropriate amount of magnesium oxide on the upper and lower surfaces of the electrical steel sheet S.

In this state, the bubble detector (25a) (25b) made of a photo sensor observes the contact point of the coating roll (110a) (110b) and the electrical steel sheet (S) when the bubble is formed, the electric signal The signal generator 20 is provided.

Accordingly, the signal generator 20 operates the ultrasonic wave generators 10a and 10b in a preset operation mode. For example, when the ultrasonic generators 10a and 10b of the upper and lower sides are alternately operated to operate and stop for 1 second so as not to resonate with each other, the electrical steel sheet S is sequentially repeated about 10 seconds. To give vibration.

Such ultrasonic vibrations impact the air bubbles 130 formed at the contact point between the coating rolls 110a and 110b and the steel plate S through the steel sheet S, which is inside the air bubbles 130. Due to the heat generation and expansion due to vibration, the air bubbles 130 are blown, or moved to one side of the steel sheet (S) to flow down to the outside of the steel sheet (S), thereby eliminating the defects of the uncoated stripes (P) It is. When the air bubbles 130 are removed as described above, the effect of drying the magnesium oxide solution L may be affected, such that the drying time may be shortened.

When the air bubble 130 is removed by this operation, the ultrasonic oscillation in the ultrasonic generators 10a and 10b is stopped, but if the air bubble 130 is left without being removed, continuous ultrasonic vibration is generated in the signal generator 20. ) And the ultrasonic generators 10a and 10b are continuously applied to the steel sheet S.

  In addition, when vibration is applied to the steel sheet S as described above, the magnesium oxide solution L coated on the surface of the steel sheet S in the shape of the groove groove 112 of the coating rolls 110a and 110b is magnesium oxide. Although the viscosity of the solution (L) is maintained, the ultrasonic vibration vibrates the grooved magnesium oxide coating layer (C) to form a concave-convex shape of the groove flat to have a uniform thickness on the surface of the electrical steel sheet (S) The effect of forming the film coating layer (C) is also obtained.

The formation state of such a coating layer (C) is shown in FIG. 8. The uniform coating of the magnesium oxide solution is achieved by removing the air bubbles 130 between the coating rolls 110a and 110b and the steel sheet S, and the stripes P of the grooves 112 are formed. Is uniformly flattened to obtain a coating layer (C) of good quality.

According to the present invention as described above, the air bubbles 130 formed on the surface of the electrical steel sheet (S) by applying ultrasonic vibration to the surface of the steel sheet (S) is automatically coated with magnesium oxide, regardless of the manual operation of the operator It can be removed, thereby removing the uncoated streaks (P), and uniform thickness by smoothing the streak (P) form of magnesium oxide formed by the groove groove 112 of the coating roll (110a) (110b) The improved effect is obtained so that the plating layer of.

Therefore, it is possible to obtain a high-quality electrical steel sheet, as well as to obtain the effect of automating work to prevent the safety accident of the operator.

Claims (4)

In the case of coating magnesium oxide (MgO) on the surface of the electrical steel sheet in the electrical steel sheet manufacturing equipment, in the apparatus for preventing the coating layer defects on the surface of the steel sheet, A plurality of ultrasonic wave generators (10a) (10b) for applying ultrasonic waves to the upper and lower sides of the steel sheet (S) in the rear of the coating roll (110a) (110b) disposed on the transfer path of the electrical steel sheet, the ultrasonic wave Including the ultrasonic signal generator 20 for providing a signal to the generator (10a) (10b) by applying a vibration to the steel sheet (S) to remove the air bubbles 130 by the ultrasonic vibration, the coating roll (110a) ( 110b) is configured to remove the streaks P due to the groove groove shape, When bubbles are formed by observing the contact points between the coating rolls 110a and 110b and the electrical steel sheet S, the ultrasonic signal generator 20 provides an electrical signal to the ultrasonic signal generator 20 in advance. Streaks in MgO coating of electrical steel sheet further comprising bubble detectors 25a and 25b electrically connected to the ultrasonic signal generator 20 to operate the ultrasonic generators 10a and 10b in the operation mode set at Prevention device. The apparatus of claim 1, wherein the bubble detectors (25a, 25b) are made of a photo sensor. According to claim 1, The ultrasonic generator (10a, 10b) and the ultrasonic signal generator 20 is provided with a bogie (50) to move the upper and lower portions of the electrical steel sheet (S), to maintain at an appropriate height, The trolley 50 has a frame 55 which is movable on the rail 52 formed in the width direction of the steel plate S, and a plurality of traveling wheels 57 are mounted on the lower end of the frame 55 so that the traveling motor ( 59) anti-striping device for MgO coating of electrical steel sheet, characterized in that the forward and backward on the rail (52) by. According to claim 3, The bogie 50 is mounted so that the screw shaft 62 is rotatable in the vertical direction perpendicular to the frame 55, the upper and lower rotation motors ( 65 is connected to the screw shaft 62, the upper and lower right threaded portion (67a) and left side threaded portion (67b) are formed, respectively, from the middle of the screw shaft 62, the right screw portion (67a) and left side threaded portion (67b) A plurality of lifting blocks 69a and 69b are screwed to each other, and expansion plates 12a and 12b are connected to the lifting blocks 69a and 69b, respectively. The lifting blocks 69a and 69b respectively have inner grooves 82a and 82b of the vertical pillars 80a and 80b that guide guides 78a and 78b protrude from both sides thereof to form the frame 55. By being slidably fitted into the upper and lower blocks, the lifting blocks 69a and 69b move up and down along the right and left screw portions 67a and left screw portions 67b of the screw shaft 62 by the operation of the forward and reverse rotation motor 65. It is guided vertically to the ascending and descending, anti-striping device when MgO coating of electrical steel sheet, characterized in that it operates to move closer or farther from each other with respect to the steel sheet (S).

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